Use mocha --compilers to test import runtime

Makefile

@@ -118,6 +118,10 @@ test/features: bin/traceur.js bin/traceur-runtime.js $(FEATURE_TESTS)
 test/%-run: test/% bin/traceur.js
 	node_modules/.bin/mocha $(MOCHA_OPTIONS) $<
 
+test/mocha: bin/traceur.js
+	node_modules/.bin/mocha $(MOCHA_OPTIONS) \
+		--compilers js:test/cjs-mocha-compiler.js --reporter dot test/feature/**
+
 test/commonjs: test/commonjs-compiled
 	node_modules/.bin/mocha $(MOCHA_OPTIONS) test/node-commonjs-test.js
 

test/cjs-mocha-compiler.js

@@ -0,0 +1,43 @@
+'use strict';
+
+var fs = require('fs');
+var traceurAPI = require('../src/node/api.js');
+
+var org = require.extensions['.js'];
+require.extensions['.js'] = function(module, path) {
+  if (!/\/node_modules\//.test(path)) {
+    var content = fs.readFileSync(path, 'utf8');
+    if (shouldSkip(path, content)) {
+      return;
+    }
+
+    var compiled = traceurAPI.compile(content, {
+      modules: 'commonjs',
+      importRuntime: true,
+    }, path, path);
+
+
+    if (needsWrapper(path)) {
+      var header = 'var assert = require("chai").assert, test = require("mocha").test;' + 'test("' + path + '", function(){';
+      var footer = '});';
+      compiled = header + compiled + footer;
+    }
+
+    try {
+      return module._compile(compiled, path);
+    } catch (ex) {
+      console.log(compiled, path);
+      throw ex;
+    }
+  }
+  return org(module, path);
+};
+
+function needsWrapper(path) {
+  return /\/test\/feature\//.test(path) && !/\/resources\//.test(path);
+}
+
+function shouldSkip(path, content) {
+  return /\/\/ (Error:|Options:|Skip.|Async.)/.test(content) ||
+      /\.script\.js$/.test(path);
+}

test/feature/Modules/ImportDefault.js

@@ -1,3 +1,5 @@
+import {assert} from '../../asserts.js';
+
 import x from './resources/default.js';
 assert.equal(x, 42);
 

test/feature/Modules/resources/default-class.js

@@ -1,3 +1,5 @@
+import {assert} from '../../../asserts.js';
+
 export default class C {
   m() {
     return 'm';

test/feature/Modules/resources/default-function.js

@@ -1,3 +1,5 @@
+import {assert} from '../../../asserts.js';
+
 export default function f() {
   return 123;
 }

test/feature/TemplateLiterals/resources/m.js

@@ -1,3 +1,5 @@
+
+import {assert} from '../../../asserts.js';
 import {f} from './f.js';
 
 assert.equal('a', (f `a`)[0][0]);

test/feature/TemplateLiterals/resources/n.js

@@ -1,3 +1,4 @@
+import {assert} from '../../../asserts.js';
 import {f} from './f.js';
 
 assert.equal('b', (f `b`)[0][0]);